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Finding the Fourth Proportional to 520,085.35, 780,128.03 and 520,085.35

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Solution

The fourth proportional to 520,085.35, 780,128.03 and 520,085.35 is: 780,128.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,085.35 : 780,128.03 = 520,085.35 : x
  2. Step 2: Convert to fraction form
    520,085.35/780,128.03 = 520,085.35/x
  3. Step 3: Cross multiply
    520,085.35x = 780,128.03 × 520,085.35
  4. Step 4: Simplify right side
    520,085.35x = 405,733,159,527.36
  5. Step 5: Solve for x
    x = 405,733,159,527.36/520,085.35
  6. Step 6: Final answer
    x = 780,128.03

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.